Tanith &
Sanna work very well.
Audrey, which happens to be my name, doesn't.
Perhaps
Rhiannon instead?
Marlene also doesn't fit in well IMO.
Rhiannon may not fit in as well as it sound I think but it wouldn't stick out as much as
Marlene &
Audrey in that set, IMO. I picture the first 2 names in a siblingset of names that are exotic sounding, far less frequented and unknown whereas the other 2, I picture in a set of more known and classic names.